new_op.cc revision 285830
1// Support routines for the -*- C++ -*- dynamic memory management. 2 3// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2004 4// Free Software Foundation 5// 6// This file is part of GCC. 7// 8// GCC is free software; you can redistribute it and/or modify 9// it under the terms of the GNU General Public License as published by 10// the Free Software Foundation; either version 2, or (at your option) 11// any later version. 12// 13// GCC is distributed in the hope that it will be useful, 14// but WITHOUT ANY WARRANTY; without even the implied warranty of 15// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16// GNU General Public License for more details. 17// 18// You should have received a copy of the GNU General Public License 19// along with GCC; see the file COPYING. If not, write to 20// the Free Software Foundation, 51 Franklin Street, Fifth Floor, 21// Boston, MA 02110-1301, USA. 22// 23// As a special exception, you may use this file as part of a free software 24// library without restriction. Specifically, if other files instantiate 25// templates or use macros or inline functions from this file, or you compile 26// this file and link it with other files to produce an executable, this 27// file does not by itself cause the resulting executable to be covered by 28// the GNU General Public License. This exception does not however 29// invalidate any other reasons why the executable file might be covered by 30// the GNU General Public License. 31 32#include <bits/c++config.h> 33#include <cstdlib> 34#include <exception_defines.h> 35#include "new" 36 37using std::new_handler; 38using std::bad_alloc; 39#if _GLIBCXX_HOSTED 40using std::malloc; 41#else 42// A freestanding C runtime may not provide "malloc" -- but there is no 43// other reasonable way to implement "operator new". 44extern "C" void *malloc (std::size_t); 45#endif 46 47extern new_handler __new_handler; 48 49_GLIBCXX_WEAK_DEFINITION void * 50operator new (std::size_t sz) throw (std::bad_alloc) 51{ 52 void *p; 53 54 /* malloc (0) is unpredictable; avoid it. */ 55 if (sz == 0) 56 sz = 1; 57 p = (void *) malloc (sz); 58 while (p == 0) 59 { 60 new_handler handler = __new_handler; 61 if (! handler) 62#ifdef __EXCEPTIONS 63 throw bad_alloc(); 64#else 65 std::abort(); 66#endif 67 handler (); 68 p = (void *) malloc (sz); 69 } 70 71 return p; 72} 73